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Tracking of an aircraft flying at an af'titude of 100 ft above the sea was accomplished over a radial range interval r anging from 1400 to 1000 naut mi by using the Project MADRE radar. Simultaneous tracking, over part of this range interval, of another aircraft at 10,000 ft ilk •trates the target altitude independence characteristic of over-the-horizon techniquest V PROBLEM STATUS This is an interim report; work on the problem is continuing.

Interference to communication reception near an HF radar is dependent on many factors. It is shown that the most important of these that can be controlled is the pulse shape ofthe radar. Under optimum conditions, acceptablereceptionshouldbe possible with frequency separation as little as 21 kHz from the proposed radar. At separations up to 450kHz, only occasional interference problems are expected.

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Continue on reverse aide If necessary nd identify by block number) (U) Magnetic tape recordings of the AN/FPS-95 OTH radar receiver output have been converted on a general purpose computer to a form suitable for playback on the MADRE radar signal processor. These playbacks demonstrate the excellent detection capability of the AN/FPS-95 when used in conjunction with the MADRE processor and displays. The usefulness of clutter filtering, doppler shifting, and data word bit selection are demonstrated.